The report, produced by the U.S. Department of the Interior Policy and Administration, Denver, Colorado office, (dated April 2011) responds to requirements under the SECURE Water Act of 2009, and shows several increased risks to western United States water resources during the 21st century due to climate change.
"Specific projections include:
• a temperature increase of 5-7 degrees Fahrenheit;
• a precipitation increase over the northwestern and north-central portions of the western United States and a decrease over the southwestern and south-central areas;
• a decrease for almost all of the April 1st snowpack, a standard benchmark measurement used to project river basin runoff; and
• an 8 to 20 percent decrease in average annual stream flow in several river basins, including the Colorado, the Rio Grande, and the San Joaquin."
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